A new carotenoid, 5,6-dihydrocrustaxanthin, from prawns and the distribution of yellow xanthophylls in shrimps

A new yellow carotenoid, named 5,6-dihydrocrustaxanthin (6), was isolated together with five yellow xanthophylls: isoastaxanthin (1), 5,6-dihydropenaeusxanthin (2), penaeusxanthin (3), tetrahydroxypirardixanthin (4), and crustaxanthin (5) from three species of prawns: Marsupenaeus japonicus, Litopenaeus vannamei, and Metapenaeus joyneri, belonging to Penaeidae. The structure of (6) was determined to be...